Helium abundance difference within globular clusters: NGC 2808

Autores
Cacciari, Carla; Pasquini, L.; Valenti, E.; Käufl, H. U.; Mauas, Pablo Jacobo David
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Multiple populations have been recently detected in most Galactic globular clusters, even with no significant spread in metallicity. Unusual features of the observed colourmagnitude diagrams can be explained by differences in the He content of the stars belonging to the sub-populations. We report on empirical evidence of He abundance spread in a few globular clusters, with particular attention to NGC 2808, where He abundance variation has been measured in a pair of otherwise identical red giant stars using the HeI 1083 nm line.A quantitative estimate of this difference has been derived by appropriate chromospheric modelling, in very good agreement with stellar evolution requirements.
Fil: Cacciari, C.. INAF, Observatorio Astronomico di Bologna; Italia
Fil: Pasquini, L.. ESO; Alemania
Fil: Valenti, E.. ESO; Alemania
Fil: Käufl, H. U.. ESO; Alemania
Fil: Mauas, Pablo Jacobo David. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Materia
Stars: Abundances
Stars: Atmospheres
Globular Clusters: Individual: Ngc 2808
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/16803
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Helium abundance difference within globular clusters: NGC 2808Cacciari, CarlaPasquini, L.Valenti, E.Käufl, H. U.Mauas, Pablo Jacobo DavidStars: AbundancesStars: AtmospheresGlobular Clusters: Individual: Ngc 2808https://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Multiple populations have been recently detected in most Galactic globular clusters, even with no significant spread in metallicity. Unusual features of the observed colourmagnitude diagrams can be explained by differences in the He content of the stars belonging to the sub-populations. We report on empirical evidence of He abundance spread in a few globular clusters, with particular attention to NGC 2808, where He abundance variation has been measured in a pair of otherwise identical red giant stars using the HeI 1083 nm line.A quantitative estimate of this difference has been derived by appropriate chromospheric modelling, in very good agreement with stellar evolution requirements.Fil: Cacciari, C.. INAF, Observatorio Astronomico di Bologna; ItaliaFil: Pasquini, L.. ESO; AlemaniaFil: Valenti, E.. ESO; AlemaniaFil: Käufl, H. U.. ESO; AlemaniaFil: Mauas, Pablo Jacobo David. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaSocieta Astronomica Italiana2015-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/16803Cacciari, Carla; Pasquini, L.; Valenti, E.; Käufl, H. U.; Mauas, Pablo Jacobo David; Helium abundance difference within globular clusters: NGC 2808; Societa Astronomica Italiana; Memorie della Società Astronomica Italiana; 86; 1-2015; 207-2101824-016X0037-8720enginfo:eu-repo/semantics/altIdentifier/url/http://sait.oat.ts.astro.it/MSAIt860215/PDF/2015MmSAI..86..207C.pdfinfo:eu-repo/semantics/altIdentifier/url/http://sait.oat.ts.astro.it/ToC.htm#2015info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:55:31Zoai:ri.conicet.gov.ar:11336/16803instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:55:32.055CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Helium abundance difference within globular clusters: NGC 2808
title Helium abundance difference within globular clusters: NGC 2808
spellingShingle Helium abundance difference within globular clusters: NGC 2808
Cacciari, Carla
Stars: Abundances
Stars: Atmospheres
Globular Clusters: Individual: Ngc 2808
title_short Helium abundance difference within globular clusters: NGC 2808
title_full Helium abundance difference within globular clusters: NGC 2808
title_fullStr Helium abundance difference within globular clusters: NGC 2808
title_full_unstemmed Helium abundance difference within globular clusters: NGC 2808
title_sort Helium abundance difference within globular clusters: NGC 2808
dc.creator.none.fl_str_mv Cacciari, Carla
Pasquini, L.
Valenti, E.
Käufl, H. U.
Mauas, Pablo Jacobo David
author Cacciari, Carla
author_facet Cacciari, Carla
Pasquini, L.
Valenti, E.
Käufl, H. U.
Mauas, Pablo Jacobo David
author_role author
author2 Pasquini, L.
Valenti, E.
Käufl, H. U.
Mauas, Pablo Jacobo David
author2_role author
author
author
author
dc.subject.none.fl_str_mv Stars: Abundances
Stars: Atmospheres
Globular Clusters: Individual: Ngc 2808
topic Stars: Abundances
Stars: Atmospheres
Globular Clusters: Individual: Ngc 2808
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Multiple populations have been recently detected in most Galactic globular clusters, even with no significant spread in metallicity. Unusual features of the observed colourmagnitude diagrams can be explained by differences in the He content of the stars belonging to the sub-populations. We report on empirical evidence of He abundance spread in a few globular clusters, with particular attention to NGC 2808, where He abundance variation has been measured in a pair of otherwise identical red giant stars using the HeI 1083 nm line.A quantitative estimate of this difference has been derived by appropriate chromospheric modelling, in very good agreement with stellar evolution requirements.
Fil: Cacciari, C.. INAF, Observatorio Astronomico di Bologna; Italia
Fil: Pasquini, L.. ESO; Alemania
Fil: Valenti, E.. ESO; Alemania
Fil: Käufl, H. U.. ESO; Alemania
Fil: Mauas, Pablo Jacobo David. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
description Multiple populations have been recently detected in most Galactic globular clusters, even with no significant spread in metallicity. Unusual features of the observed colourmagnitude diagrams can be explained by differences in the He content of the stars belonging to the sub-populations. We report on empirical evidence of He abundance spread in a few globular clusters, with particular attention to NGC 2808, where He abundance variation has been measured in a pair of otherwise identical red giant stars using the HeI 1083 nm line.A quantitative estimate of this difference has been derived by appropriate chromospheric modelling, in very good agreement with stellar evolution requirements.
publishDate 2015
dc.date.none.fl_str_mv 2015-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/16803
Cacciari, Carla; Pasquini, L.; Valenti, E.; Käufl, H. U.; Mauas, Pablo Jacobo David; Helium abundance difference within globular clusters: NGC 2808; Societa Astronomica Italiana; Memorie della Società Astronomica Italiana; 86; 1-2015; 207-210
1824-016X
0037-8720
url http://hdl.handle.net/11336/16803
identifier_str_mv Cacciari, Carla; Pasquini, L.; Valenti, E.; Käufl, H. U.; Mauas, Pablo Jacobo David; Helium abundance difference within globular clusters: NGC 2808; Societa Astronomica Italiana; Memorie della Società Astronomica Italiana; 86; 1-2015; 207-210
1824-016X
0037-8720
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://sait.oat.ts.astro.it/MSAIt860215/PDF/2015MmSAI..86..207C.pdf
info:eu-repo/semantics/altIdentifier/url/http://sait.oat.ts.astro.it/ToC.htm#2015
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Societa Astronomica Italiana
publisher.none.fl_str_mv Societa Astronomica Italiana
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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